验证码倒计时

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<!DOCTYPE html><html><head>    <meta http-equiv="content-type" content="text/html; charset=UTF-8">    <meta content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no" id="viewport" name="viewport">    <title></title>    <script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>    <script type="text/javascript">        var countdown=60;        function settime(obj) {            if (countdown == 0) {                obj.removeAttribute("disabled");                obj.value="免费获取验证码";                countdown = 60;                return;            } else {                obj.setAttribute("disabled", true);                obj.value="重新发送(" + countdown + ")";                countdown--;            }            setTimeout(function() {                    settime(obj) }                ,1000)        }    </script><body><input type="button" id="btn" value="免费获取验证码" onclick="settime(this)" /></body></html>

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